fix(release): release-plz workflow (#14)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced a new job for creating pull requests with version updates
and changelog information.
- **Improvements**
- Renamed and restructured the release workflow for better organization.
	- Updated environment variable usage for enhanced security.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/release-plz.yml

@@ -1,4 +1,4 @@
-name: Release
+name: Release-plz
 permissions:
   pull-requests: write
   contents: write
@@ -7,8 +7,28 @@ on:
     branches:
       - main
 jobs:
-  release-plz:
-    name: Release-plz
+  # Release unpublished packages.
+  release-plz-release:
+    name: Release-plz release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.RELEASE_PLZ_TOKEN }}
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Run release-plz
+        uses: MarcoIeni/[email protected]
+        with:
+          command: release
+        env:
+          GITHUB_TOKEN: ${{ secrets.RELEASE_PLZ_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+  # Create a PR with the new versions and changelog, preparing the next release.
+  release-plz-pr:
+    name: Release-plz PR
     runs-on: ubuntu-latest
     concurrency:
       group: release-plz-${{ github.ref }}
@@ -19,8 +39,12 @@ jobs:
         with:
           fetch-depth: 0
           token: ${{ secrets.RELEASE_PLZ_TOKEN }}
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
       - name: Run release-plz
         uses: MarcoIeni/[email protected]
+        with:
+          command: release-pr
         env:
           GITHUB_TOKEN: ${{ secrets.RELEASE_PLZ_TOKEN }}
           CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}